Missing Activity Data for Exchange using Office 365 Management Activity API
I have a prototype working of the Office 365 Management Activity API features. I've successfully created subscriptions with webhooks and am getting data for both SharePoint and Azure AD. However, for some reason no data is ever delivered for Exchange. I've triple-checked and when I list subscriptions it shows Exchange just like the other two - enabled and ready to go - but no data ever shows up. Also if I make the REST call to list notifications it also shows no data for Exchange, but I can get SharePoint and Azure AD data from it. What else might I need to do to get these audit events for Exchange as well?